78688 has 12 divisors (see below), whose sum is σ = 154980. Its totient is φ = 39328.

The previous prime is 78653. The next prime is 78691. The reversal of 78688 is 88687.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1198 + ... + 1261.

It is an arithmetic number, because the mean of its divisors is an integer number (12915).

2⁷⁸⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

78688 is a deficient number, since it is larger than the sum of its proper divisors (76292).

78688 is a wasteful number, since it uses less digits than its factorization.

78688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469 (or 2461 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 78688 is about 280.5138142766. The cubic root of 78688 is about 42.8518427308.

Subtracting 78688 from its reverse (88687), we obtain a palindrome (9999).

The spelling of 78688 in words is "seventy-eight thousand, six hundred eighty-eight".